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The relation between the bone histomorphometric profile of the iliac crest and regions of the proximal femur was investigated. In the proximal femur four blocks were selected, representing the subchondral principal compressive (SPC) and tensile (SPT) regions, the zone near the medial cortex in the principal compressive region (MPC), and the zone medial to the greater trochanter (MGT). Undecalcified tissue sections stained by the von Kossa silver method and counterstained with haematoxylin and eosin were used for quantitation. The SPT region was most representative of the iliac bone profile, in particular the structural parameters of mineralised bone, trabecular thickness, and trabecular spacing and resorption surface. Most parameters in the regions studied showed inconsistent and variable results when compared with those of the iliac crest. There was only a weak association, therefore, between the histomorphometric parameters of the iliac crest and the proximal femur despite the appeal of the use of the iliac biopsy specimen as a simple clinical test.